Here's a link to The Infinite Cat Project: The Infinite Cat Project
An extra 51 levels for Runes of Avalon have been released by Anawiki Games as part of a free trial. You don't have to have the original Runes of Avalon to play them.
Here's the link associated with this blurb.
Blurbs like this one are intended to be shown in the "Elsewhere" column on Casual Explosion's main page. Hence this page is a bit sparse...